A-549 cells are used as an in vitro model for a type II pulmonary epithelial cell model for drug metabolism. Cells are cytokeratin positive by immunoperoxidase staining.
This line was initiated in 1972 by D.J. Giard, et al. through explant culture of lung carcinomatous tissue from a 58-year-old Caucasian male (PubMed 4357758). Further studies by M. Lieber, et al. revealed that A549 cells could synthesize lecithin with a high percentage of desaturated fatty acids utilizing the cytidine diphosphocholine pathway (PubMed 175022).

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